Information circular / Illinois State Geological Survey ; [no. 60]
Cover title
"Reprinted from the Transactions, Illinois State Academy of Science, vol. 32, no. 2, December 1939 (1940)."
The age of the LaSalle anticline / J. Norman Payne -- Progress in geologic mapping of Illinois, 1839-1939 / J. Marvin Weller -- The Covel conglomerate, a guide bed in the Pennsylvanian of northern Illinois / H.B. Willman -- Silurian rocks of southern Illinois / John R. Ball -- Some geological factors in the location and construction of the Lake Springfield dam / George E. Ekblaw -- Some chemical changes in coal samples during storage / O.W. Rees, M.L. Kalinowski -- Notes on the histology of an Illinois Psaronius / Geraldine Moon